/*
 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under both the BSD-style license (found in the
 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
 * in the COPYING file in the root directory of this source tree).
 * You may select, at your option, one of the above-listed licenses.
 */

/* Note : this module is expected to remain private, do not expose it */

#ifndef ERROR_H_MODULE
#define ERROR_H_MODULE

#if defined(__cplusplus)
extern "C" {
#endif

/* ****************************************
 *  Dependencies
 ******************************************/
#include <stddef.h>      /* size_t */
#include "zstd_errors.h" /* enum list */

/* ****************************************
 *  Compiler-specific
 ******************************************/
#if defined(__GNUC__)
#define ERR_STATIC static __attribute__((unused))
#elif defined(__cplusplus) || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#define ERR_STATIC static inline
#elif defined(_MSC_VER)
#define ERR_STATIC static __inline
#else
#define ERR_STATIC \
  static /* this version may generate warnings for unused static functions; disable the relevant warning */
#endif

/*-****************************************
 *  Customization (error_public.h)
 ******************************************/
typedef ZSTD_ErrorCode ERR_enum;
#define PREFIX(name) ZSTD_error_##name

/*-****************************************
 *  Error codes handling
 ******************************************/
#undef ERROR /* reported already defined on VS 2015 (Rich Geldreich) */
#define ERROR(name) ZSTD_ERROR(name)
#define ZSTD_ERROR(name) ((size_t)-PREFIX(name))

ERR_STATIC unsigned ERR_isError(size_t code)
{
  return (code > ERROR(maxCode));
}

ERR_STATIC ERR_enum ERR_getErrorCode(size_t code)
{
  if (!ERR_isError(code))
    return (ERR_enum)0;
  return (ERR_enum)(0 - code);
}

/*-****************************************
 *  Error Strings
 ******************************************/

const char* ERR_getErrorString(ERR_enum code); /* error_private.c */

ERR_STATIC const char* ERR_getErrorName(size_t code)
{
  return ERR_getErrorString(ERR_getErrorCode(code));
}

#if defined(__cplusplus)
}
#endif

#endif /* ERROR_H_MODULE */
